package com.star.starojcodesandbox;

import cn.hutool.core.io.FileUtil;
import cn.hutool.core.io.resource.ResourceUtil;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.StrUtil;
import cn.hutool.dfa.WordTree;
import com.star.starojcodesandbox.model.ExecuteCodeRequest;
import com.star.starojcodesandbox.model.ExecuteCodeResponse;
import com.star.starojcodesandbox.model.ExecuteMessage;
import com.star.starojcodesandbox.model.JudgeInfo;
import com.star.starojcodesandbox.utils.ProcessUtils;

import java.io.File;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class JavaNativeCodeSandboxOld implements CodeSandbox {
    private static final String GLOBAL_CODE_DIR_NAME = "tmpCode";
    private static final String GLOBAL_JAVA_CLASS_NAME = "Main.java";

    private static final String SECURITY_MANAGER_PATH = "D:\\Ideaproject\\staroj-code-sandbox\\src\\main\\resources\\security";
    private static final String SECURITY_MANAGER_CLASS_NAME = "MySecurityManager";

    private static final List<String> BLACK_LIST = Arrays.asList("Files", "exec");
    private static final WordTree WORD_TREE;
    static {
        WORD_TREE = new WordTree();
        WORD_TREE.addWords(BLACK_LIST);
    }

    public static void main(String[] args) {
        JavaNativeCodeSandboxOld javaNativeCodeSandbox = new JavaNativeCodeSandboxOld();
        ExecuteCodeRequest executeCodeRequest = new ExecuteCodeRequest();
        executeCodeRequest.setInputList(Arrays.asList("1 2", "1 3"));
//        String code = ResourceUtil.readStr("testCode/simpleComputeArgs/Main.java", StandardCharsets.UTF_8);
        String code = ResourceUtil.readStr("testCode/unsafeCode/RunFileError.java", StandardCharsets.UTF_8);
//        String code = ResourceUtil.readStr("testCode/simpleCompute/Main.java", StandardCharsets.UTF_8);
        executeCodeRequest.setCode(code);
        executeCodeRequest.setLanguage("java");
        ExecuteCodeResponse executeCodeResponse = javaNativeCodeSandbox.executeCode(executeCodeRequest);
        System.out.println(executeCodeResponse);
    }


    @Override
    public ExecuteCodeResponse executeCode(ExecuteCodeRequest executeCodeRequest) {

//        System.setSecurityManager(new DefaultSecurityManager());
        List<String> inputList = executeCodeRequest.getInputList();
        String code = executeCodeRequest.getCode();
        String language = executeCodeRequest.getLanguage();

        //从程序中进行限制
//        FoundWord foundWord = WORD_TREE.matchWord(code);
//        if (foundWord != null) {
//            System.out.println("代码包含禁止词汇" + foundWord.getFoundWord());
//            return null;
//        }

        //1.把用户的代码保存为文件
        String userDir = System.getProperty("user.dir");
        String globalCodePathName = userDir + File.separator + GLOBAL_CODE_DIR_NAME;
        if (!FileUtil.exist(globalCodePathName)) {
            FileUtil.mkdir(globalCodePathName);
        }
        // 把用户的代码隔离存放 uuid
        String userCodeParentPath = globalCodePathName + File.separator + UUID.randomUUID();
        String userCodePath = userCodeParentPath + File.separator + GLOBAL_JAVA_CLASS_NAME;
        File userCodeFile = FileUtil.writeString(code, userCodePath, StandardCharsets.UTF_8);

        //2. 编译代码

        String compileCmd = String.format("javac -encoding utf-8 %s", userCodeFile.getAbsolutePath());
        try {
            Process compileProcess = Runtime.getRuntime().exec(compileCmd);
            ExecuteMessage executeMessage = ProcessUtils.runProcessAndGetMessage(compileProcess, "编译");
            System.out.println(executeMessage);
        } catch (IOException e) {

            return getErrorResponse(e);

        }
        //3. 运行代码
        List<ExecuteMessage> executeMessageList = new ArrayList<>();
        for (String inputArgs : inputList) {
            //String runCmd = String.format("java -Xmx256m -Dfile.encoding=UTF-8 -cp %s Main %s", userCodeParentPath, inputArgs);
            String runCmd = String.format("java -Xmx256m -Dfile.encoding=UTF-8 -cp %s;%s -Djava.security.manager=%s Main %s", userCodeParentPath, SECURITY_MANAGER_PATH, SECURITY_MANAGER_CLASS_NAME, inputArgs);
            try {
                Process runProcess = Runtime.getRuntime().exec(runCmd);
                // 时间限制， 避免永久睡眠
                new Thread(() -> {
                    try {
                        Thread.sleep(5000L);
                    } catch (InterruptedException e) {
                        System.out.println("超出时间限制");
                        e.printStackTrace();
                    }
                    runProcess.destroy();
                }).start();

                ExecuteMessage executeMessage = ProcessUtils.runProcessAndGetMessage(runProcess, "运行");
                executeMessageList.add(executeMessage);
                System.out.println(executeMessage);
            } catch (Exception e) {
                return getErrorResponse(e);
            }

        }

        // 4. 整理输出结果
        ExecuteCodeResponse executeCodeResponse = new ExecuteCodeResponse();
        List<String> outputList = new ArrayList<>();

        long maxTime = 0;
        for (ExecuteMessage executeMessage : executeMessageList) {
            String errorMessage = executeMessage.getErrorMessage();
            if (StrUtil.isNotBlank(errorMessage)) {
                executeCodeResponse.setMessage(errorMessage);
                //在用户执行代码的时候报错
                executeCodeResponse.setStatus(3);
                break;
            }
            outputList.add(executeMessage.getMessage());
            Long time = executeMessage.getTime();
            maxTime = Math.max(time, maxTime);
        }
        if (outputList.size() == executeMessageList.size()) {
            //执行成功
            executeCodeResponse.setStatus(1);
        }
        executeCodeResponse.setOutputList(outputList);
        JudgeInfo judgeInfo = new JudgeInfo();
        judgeInfo.setTime(maxTime);
        executeCodeResponse.setJudgeInfo(judgeInfo);
        //5. 文件处理

        if (userCodeFile.getParentFile() != null) {
            boolean del = FileUtil.del(userCodeParentPath);
            System.out.println("删除" + (del ? "成功" : "失败"));
        }
        return executeCodeResponse;

    }

    /**
     * 获取错误响应
     *
     * @param e
     * @return
     */
    private ExecuteCodeResponse getErrorResponse(Throwable e) {

        ExecuteCodeResponse executeCodeResponse = new ExecuteCodeResponse();
        executeCodeResponse.setOutputList(new ArrayList<>());
        executeCodeResponse.setMessage(e.getMessage());
        // 表示代码沙箱错误
        executeCodeResponse.setStatus(2);
        executeCodeResponse.setJudgeInfo(new JudgeInfo());

        return executeCodeResponse;


    }
}